No point posting just one portable. Heres a few which are built very similar:
Brief Spec: All buttons included for full support of all N64 games Full memory pak and rumble pak support Volume control and auto switchable headphone jack Built in Expansion Pak Around 2 hours battery life
I found the acrylic method was pretty good as you can literally make whatever shaped portable you want. The only downside is have to cut all the pieces up which can be rather time consuming.